200 hour service

My boat is at 200 hours and I want do do the service, I already did the impeller 2 days ago because it burned out. Acording to my manuel im supposed to do an oil change (including filter), v-drive fluid, ballast pump impellers, it also says fuel filter but to not perform it yourself, is it hard to do, is it necessary? Also my spark plugs have a little rust on them (salt water) should i just change them out too? Who here does their own servicing? Where can I buy the penzoil oil, vdrive fluid and filters for mastercraft, also where can i buy the ballast impelleers.